Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40bca136331b8de…

MALICIOUS

PDF

71.9 KB Created: 2021-04-05 13:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dd18126b231c67249631105abcd7c6d SHA-1: 76237d26a65608e36b5ce30a8bfba39bd8ff1484 SHA-256: b40bca136331b8de6b49da85c8d98ba7b30ba9351281a3026a9ecd95737879f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, a technique often used in SEO link farms to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/award?keyword=search+a+pdf+document
    • http://reduslim-sito.site/47030828293nlw9h.pdf
    • http://pafowitowa.medianewsonline.com/marasmus_treatment.pdf
    • https://cdn-cms.f-static.net/uploads/4478933/normal_600a7c41df094.pdf
    • http://axecheat5.xyz/lucifer_flower_of_life7k4dr.pdf
    • http://study-english-02.space/xetiwoftr3nq.pdf
    • http://woxuruko.medianewsonline.com/direccin_universidad_nacional_de_colombia_sede_medelln.pdf
    • http://hd-cam-mirror-up1.club/13366544662rwplp.pdf
    • https://cdn-cms.f-static.net/uploads/4381737/normal_601a2fd0c5a18.pdf
    • https://static.s123-cdn-static.com/uploads/4489994/normal_5fe48ce613511.pdf
    • https://static.s123-cdn-static.com/uploads/4387052/normal_5fc644f0d811a.pdf
    • https://cdn-cms.f-static.net/uploads/4496824/normal_603e97f5e06d2.pdf
    • https://cdn-cms.f-static.net/uploads/4417519/normal_6050735ddb147.pdf
    • http://f13x.xyz/illuminated_manuscript_simple_definitionuhj6f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xezonijida/kugufi.pdf
    • https://s3.amazonaws.com/kumasala/nolaxibuluvebuvevom.pdf
    • https://s3.amazonaws.com/xalexojaxipud/46295290872.pdf
    • https://s3.amazonaws.com/zerepuzuze/do_you_abbreviate_months_in_ap_style.pdf
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_7b4100810648458d81faabc4639bff33.pdf?index=true
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_d22656b6e902492e9b59b45fe029c5b2.pdf?index=true
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_21e92a19f8c54d8ab9f5ebaf77d33d09.pdf?index=true
    • https://s3.amazonaws.com/mujesogi/3145208776.pdf
    • https://2b095ecd-e7a3-45cb-a122-23ed11f0a332.filesusr.com/ugd/613052_b78cbcb4b79142d58252de7a1b24eb1a.pdf?index=true
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_d041a8c63fac4c849b41bd76501828a7.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da8e.bin
eb26b3df55d58341d87c69c2be6ea1c436676a7c9ac4181eac8e364f962f9bcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8E 5288 bytes
font_01_sfnt_off0000ec67.bin
3a4ac2f103fa424412f954232c0b9788f403101d6980d765defe53921d76b33a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC67 11188 bytes

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